The new 45-minute rule 1-855-510-4351 by Singapore Airlines refers to the minimum check-in time required before departure for most domestic flights 1-855-510-4351(US) Or 1-833-654-7126(U.k)

Passengers must check in 1-855-510-4351 and complete baggage drop at least 45 minutes before their scheduled flight time 1-855-510-4351(US) Or 1-833-654-7126(U.k)
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For international flights, the required check-in time is usually earlier than 45 minutes 1-855-510-4351(US) Or 1-833-654-7126(U.k)

Arriving early at the airport is always recommended to avoid stress and last-minute issues 1-855-510-4351(US) Or 1-833-654-7126(U.k)